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Note 13 - Severance Costs - Accrued Severance Liability Activity (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Balance at | $ 235 | $ 39 | $ 39
Accrual of expense | 83 | 173 | 523
Payments | (218) | (205) | (313)
Adjustments | (14) |  | (14)
Balance at | $ 86 | $ 7 | $ 235

X
- Definition Represents information about the severance liability. + References No definition available. + Details
Name: | lyts_AccruedSeveranceLiability
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents information about the adjustments made to severance liability. + References No definition available. + Details
Name: | lyts_AdjustmentsToSeveranceLiability
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents information about cash payments related to severance liability. + References No definition available. + Details
Name: | lyts_PaymentsForSeveranceLiability
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment. + References No definition available. + Details
Name: | us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant